Key-fastener



(No Model.)

D. T. PHILLIPS.

KEY FA'STBNBR.

No. 350,839. Patented Oct. 12, 1886.

UNITED STATES PATENT FFIQEO Kl I Y-FASTEN ER.

SPECIFICATION forming part of Letters Patent No. 350,839, dated Qetcser 12, 1886.

Application filed June 12, 1896. Serial No. 205,021. (No model.)

To all whom it may concern.-

Be it known that I, DARIUS Tnxxn'r PHIL- LIPS, a citizen ot the United States ofAmerica, residing at Chicago, in the county of Cook and State of Illinois, have invented certain new and useful Improvements in Key-Fasteners, of which the following is a specification, reference being had therein to the accompanying drawings.

My invention relates to an improved keyfastener and the object of my improvement is to furnish a simple device to fasten a key in a lock on the outside or inside of a door, so that it cannot be turned in the lock.

The keyastener is so constructed that when the door islocked and the fastener applied it cannot be unlocked without breaking the key fastener.

I attain my object by the mechanism illustrated in the accompanying drawings, in which Figure 1 a perspective view of the key fastener applied to a lock. Fig. 2 is a side elevation of the fastener. Fig. 3 is aside elevation of the same, a portion thereof being shown in section. Fig. 4 is a sectional detail.

Like letters refer to like parts in each view.

A A is a common door-lock and key.

B is a thin bar of metal having twothirds ofits upper edge notched and one end rounded.

C is a piece of tube, closed at its lower end, and having a slot cut through it and partly closed at its upper end.

D is a small thumb-screw that screws into a bolt, E.

E is a small bolt having its lower end bev eled off to fit the notches in bar B.

F is a coil-spring pressing down bolt F.

G represents the slot in tube 0 through which bar B passes, with the bolt E projecting into it.

The operation and manncrof using the keyfastener is as follows: From the shape of the notches in bar B the bar can readily be pushed forward, but cannot be drawn back on account of bolt E, which is held down by spring F. To draw bar B back the thumbscrew D in bolt E is raised, allowing bar B to slide back and forth in slot G. If thumbscrew D is removed, the key-fastener cannot be removed from either side of the door without breaking it.

In using fastener, insert tube 0 into handle of the key; then push the bar B into the keyhole as far as it will go,thns rendering it impossible to turn the key in the lock. In using it as an outside fastener, unscrew the thumbscrew and remove it altogether from thetube (.3.

\Vhat I claim is In a key-fastener, the combination, with a notched bar adapted to be inserted into the keyhole, of a hollow tube having a slot in its lower end for the reception of said bar and adapted to engage the handle of thekey, a bolt located in the tube adapted for engagement with the notches in the bar, a spring operat ing upon the bolt, and a thurnb-screw removably secured to the bolt, whereby when said fastener is applied to the key upon the outside of a door the thumb-screw may be removed, substantially as and for the purpose set forth.

In testimony whereof I affix my signature in presence of two witnesses.

DARIUS TENNET PHILLIPS.

Vitnesses:

W. Rossrrnn, F. Mitts. 

